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Me and my older brother had blue and red respectively.
We worked for weeks, training and trading until we finally had 150 pokemon on my blue. I did the missingno glitch to get Mew. Catch it, save the game, reset. The save is still there. I now have all 151 pokemon.
8 year old me is proud and excited. I take my game in to school to show off my now complete pokedex. Tell everyone all through my first lesson about how I got everything, even Mew. Turn on game. File wiped. No one believes I'd done it.
I'm not gonna lie. I cried like a fuckin' baby.